Mitsubishi Electric A800-GF Instruction Manual page 103

Measurement of main circuit voltages, currents and powers
Measuring points and instruments
Item
Power supply Across R/L1 and S/L2,
voltage S/L2 and T/L3,
V T/L3 and R/L1
1
Power supply side
R/L1, S/L2, T/L3 line
current
current
I
1
R/L1, S/L2, T/L3 and
Power supply side
Across R/L1 and S/L2,
power
S/L2 and T/L3,
P
1
T/L3 and R/L1
Calculate after measuring power supply voltage, power supply side current and power supply side power.
Power supply side
power factor
Pf 1
Converter output Across P/+ and N/-
Operation enable
signal Across RDI, OH,
External thermal RES(+) and SD (for
relay signal sink logic)
Reset signal
Across A1 and C1
Alarm signal
Across B1 and C1
Output side
Across U and V, V and
voltage
W, and W and U
V 2
Output side
U, V and W line
current
currents
I 2
U, V, W and
Output side power
across U and V, V and
P
2
W
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf
2
Frequency setting Across 2, 4(+) and 5
signal Across 1(+) and 5
Frequency setting Across 10(+) and 5
power supply
Across 10E(+) and 5
Across AM(+) and 5
Across CA(+) and 5
Frequency meter
signal
Across FM(+) and SD
Across STF, STR, RH,
Start signal
RM, RL, JOG, RT, AU,
Select signal
STOP, CS, RES,
Reset signal
MRS(+) and SD (for
Output stop signal
sink logic)
Across A1 and C1
Fault signal
Across B1 and C1
102
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Measuring point Measuring instrument
Digital power meter
(designed for inverter)
P
1
----------------------- - 
Pf = 100
%
1

3V I
1 1
Digital multimeter or other tester
Digital multimeter or other tester,
or moving-coil type instrument
(internal resistance 50 k or more)
Digital multimeter or other tester
Digital power meter
(designed for inverter)
Digital power meter
(designed for inverter)
P
2

----------------------- -
Pf = 100
%
2

3V I
2 2
Digital multimeter or other tester,
or moving-coil type instrument
(internal resistance 50 k or more)
Digital multimeter or other tester
Remarks (reference measured value)
Commercial power supply
Within permissible AC voltage fluctuation (Refer
to page 106.)
P 1 = W 11 + W
Inverter LED is lit. 1.35  V
When open
20 to 30 VDC
ON voltage: 1 V or less
Continuity check
Across A1 and C1 Discontinuity
Across B1 and C1 Continuity
Difference between the phases is within 1% of
the maximum output voltage.

Difference between the phases is 10% or lower
of the rated inverter current.
P = W + W
2 21
2-wattmeter method (or 3-wattmeter method)
0 to 10 VDC, 4 to 20 mA
0 to 5 VDC and 0 to 10 VDC
5.2 VDC
10 VDC
Approximately 10 VDC at maximum
frequency
(without frequency meter)
Approximately 20 mADC at
maximum frequency
Approximately 5 VDC at maximum
frequency
(without frequency meter)
8 VDC
Pulse width T1: Adjust with C0
(Pr.900).
Pulse cycle T2: Set with Pr.55.
(frequency monitor only)
When open
20 to 30 VDC
ON voltage: 1 V or less
Continuity check
Across A1 and C1 Discontinuity
Across B1 and C1 Continuity
12 + W 13 (3-wattmeter method)
1
"SD" is
common

[Normal] [Fault]
Continuity
Discontinuity
22
"5" is .
common
T1
T2
"SD" is
common

[Normal] [Fault]
Continuity
Discontinuity